243204442131 has 32 divisors (see below), whose sum is σ = 372821403136. Its totient is φ = 138140640000.

The previous prime is 243204442123. The next prime is 243204442171. The reversal of 243204442131 is 131244402342.

It is not a de Polignac number, because 243204442131 - 2³ = 243204442123 is a prime.

It is a super-2 number, since 2×243204442131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243204442171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8656056 + ... + 8684106.

It is an arithmetic number, because the mean of its divisors is an integer number (11650668848).

Almost surely, 2^243204442131 is an apocalyptic number.

243204442131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243204442131 is a deficient number, since it is larger than the sum of its proper divisors (129616961005).

243204442131 is a wasteful number, since it uses less digits than its factorization.

243204442131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30523.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 243204442131 its reverse (131244402342), we get a palindrome (374448844473).

The spelling of 243204442131 in words is "two hundred forty-three billion, two hundred four million, four hundred forty-two thousand, one hundred thirty-one".